The A4409 is a power management IC that uses a buck or
buck-boost pre-regulator to efficiently convert automotive
battery voltages into a tightly regulated intermediate voltage,
complete with control, diagnostics, and protections. The output
of the pre-regulator supplies a 5 V, 300 mAMIN LDO and a 5 V,
200 mAMIN LDO. Designed to supply CAN or microprocessor
power supplies in high-temperature environments, the A4409
is ideal for underhood applications.

Enable-input to the A4409 is compatible to a high-voltage
battery level (ENBAT).

Diagnostic outputs from the A4409 include a power-on-reset
output (NPOR) with a fixed 22.5 ms typical delay. Dual
bandgaps, one for regulation and one for fault checking,
improve long-term reliability of a system designed around
the A4409.

The A4409 contains a window watchdog timer that can be
programmed to accept a wide range of clock frequencies
(WDADJ). The watchdog timer has a fixed 30 ms activation
delay to accommodate processor startup. The watchdog timer
has an enable/disable pin (active low, WDENn) to facilitate
initial factory programming or field reflash programming.

Allegro's A4409 is a Quality Managed (QM) product that has been developed according to the automotive quality requirements of TS 16949 and contains features targeted for automotive safety applications. This product can be qualified for use in accordance with ISO 26262 in compliant safety systems by ensuring a robust integration of the component into the system design. Safety documentation will be provided to support and guide the integration process.

Applications

Provides System Power for (μC/DSP, CAN, sensors, etc.)
in Automototive Control Modules, such as:

Allegro’s products are not to be used in any devices or systems, including but not limited to life support devices or systems, in which a failure of Allegro’s product can reasonably be expected to cause bodily harm.